12
307982
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
Before servicing this equipment, always make sure to
relieve the pressure.
NOTE:
Check all possible problems and solutions
before disassembling the pump.
Problem
Cause
Solution
Pump fails to operate
Restricted line or inadequate air sup-
ply
Clear line; see
Technical Data
on
pages 22--24.
Insufficient air pressure; closed or
clogged air valve, etc.
Open; clear.
Obstructed fluid hose or spray gun
Clear.*
Dried fluid on the displacement rod.
Clean; see
Service
on page 14.
Dirty or worn air motor parts
Clean; service. See air motor manual,
supplied.
Air motor icing
Reduce air line moisture content.**
Pump operates, but output is low
on both strokes
Restricted line or inadequate air sup-
ply
Clear line; See
Technical Data
on
pages 22--24.
Insufficient air pressure; closed or
clogged air valve, etc.
Open; clear.
Obstructed fluid hose or gun
Clear.*
Open bleeder valve
Close.
Air leaking into supply drum
Check inductor on ram plate seal.
Fluid too heavy for pump to prime
Use bleeder valve (see
Operation
on
page 8). Use inductor or ram unit.
Worn throat packings in displacement
pump
Replace gland/packing stack.
Air motor icing
Reduce air line moisture content.**
Pump operates, but output low on
downstroke
Fluid too heavy for pump to prime
Use bleeder valve (see
Operation
on
page 8). Use inductor or ram unit.
Held open or worn piston valve or
packings
Clear valve; replace gland/packing
stack.
Air motor icing
Reduce air line moisture content.**
Pump operates but output low on
upstroke
Held open or worn piston valve or
packings
Clear valve; replace gland/packing
stack.
p
Air motor icing
Reduce air line moisture content.**
Continued on the following page.
